Colored caoutchouc substances and process of making same.



UNITED STATES PATENT orrron.

' KURT GOTTLOB, OF ELIBERFELD, GERMANY, ASSIGNOR TO FARBENFAIBBIKEN VOBM.

FBIEDR. BAYER & 00., OF ELBERFELD, GERMANY, ACORP ORATION 0F GERMANY.

COLORED CAOUTCHOUC SUBSTANCES AND PROCESS OF MAKIN G SAME.

No Drawing.

Specification of Letters Patent.

Application filed. October 16, 1912. Serial No. 726,067.

vulcanization temperature. It was highly surprising that the organic dyes could stand this process without injury to their valuable properties. p

In order to illustrate the new process more fully the following example is given, the parts being by'weight :100 parts of rubber are mixed between rollers with 10 parts of helio fast red BL, 10 parts of sulfur and 100 parts of white of zinc and the mixture is vulcanized at 170? C. A beautiful bright red is thus obtained.

It is of course quiteimpossible to mention all colors which can be used in this new process; The following are types contain-- ing wide range of shades which have given highly satisfactory results; azo-colors, such as helio-bordeaux BL, helio fast yellow SGL extra, ceres orange, etc., naturally there are a large number of other orgamc coloring matters which can be used. A simple test will show whether they are suitable or not and I do not limit myself to the instances mentioned.

I claim I v 1. Process for the production of colored caoutchouc, which process consists in first treating caoutchouc materials with organic dyes, and in vulcanizing them after being thus colored by heating with sulfur at the vulcanization temperature, substantially as 7 described.

2. Process for the production of colored caoutchouc like 'materials, which process consists in firsttreating caoutchouc like materials with or anic dyes, and in vulcanizing themafter belng .thus colored by heating with sulfur at the. vulcanization temperature, substantially as described. v I 3. Process for the production of colored caoutchouc, which process consists in first treating caoutchouc materials with organic azo dyes, and in vulcanizing them after being thus colored by heating. with sulfur at the vulcanization temperature, substantially as described. v

4. Process for the production of colored caoutchouc-like materials, which rocess consists in first treating caoutchouc-li e materials with organic azo dyes, and in vulcanizing them after being thus colored by heating with sulfur atv the vulcanization temperature, substantially as described.

5. As new products vulcanized caoutchouc substances comprising caoutchouc vulcanized with sulfur and colored withorganic dyes incorporated therewith before the vulcanization, substantially as described.

6. As new products vulcanized caoutchouc like substances comprising caoutchouc-like substances vulcanized with sulfur and col-. ored with organic dyes incorporated therewith before the vulcanization, substantially as described.

. 7. As new products vulcanized caoutchouc substances comprising caoutchouc vulcanized with sulfur and colored with organic azo dyes incorporated therewith before the vulcanization.

8. As new products vulcanized caoutchouclike substances comprising a caoutchouc- Patented Oct. 13, 1914.

like substance .vulcanized with sulfur and colored with organic azo dyes incorporated therewith before vulcanization.

In testimony whereof I have hereunto set my hand in the presence-of .two subscribing witnesses.

KURT GOTTLOB. [1,. s.] Witnesses:

CHAS. J Wn'ron'r, ALBERT Nurnn. 

